...-parametric geoscientific investigations on the Killari borehole basalts, located in the southern part of the Deccan Volcanic Province, indicate that the presence of chlorophaeite and opaque minerals in the rock groundmass significantly contributes to this anomalous behavior. This finding is pertinent...

... In this paper we present a mathematical formulation for the borehole fluid multipole wavefield due to a unipole excitation. Unipole source and multipole receiver array are axially offset from each other and located on the rim of an eccentered elastic tool submersed in a fluid-filled borehole...

... Borehole acoustic-wave reflection imaging technology is now widely used in high-angle and/or horizontal wells to delineate geological features in the formation surrounding the well. We develop an application that combines the fourcomponent dipole shear-wave azimuthal imaging with a coordinate...

... Tool eccentricity is a common occurrence in complex borehole environments, such as large boreholes, highly deviated wells or horizontal wells. Therefore, we analyze the model of acoustic logging with an eccentric tool in a dual-cylindrical coordinate system centered on the tool and borehole...

... In this study, we explore the use of different wavefields recorded in VSP surveys to conduct time-lapse seismic monitoring of CO 2 migration in the subsurface. To do so, we perform a series of VSP experiments employing a surface source and an array of borehole hydrophones to establish...

... borehole before and after the seawater/CO2 fluid injection and determine the injected fluid’s location after the injection. The results of the inversion of the post-injection survey data clearly showed the location of the conductive zone associated with the injected seawater/CO2 in the reservoir...

... We conducted geophysical explorations in the Kijiyama geothermal field to determine subsurface structures using DTS and DAS measurements in a hot geothermal borehole. The temperature reached 288ºC at the borehole depth of 2 km. We determined the 3D Vp structures that satisfied the geological...

... from the borehole. upstream oil & gas drilling operation geology directional drilling reservoir boundary complex reservoir log analysis fracture well logging china government imaging geological subdiscipline geologist asia government hydraulic fracturing reservoir...

... measured in shallow boreholes. The method relies on the parametric inversion of magnetic data from multiple boreholes and uses line segments to represent unknown metallic pipes. We have tested the validity of the approach using synthetic datasets and applied it in an on-going infrastructure project. Both...

... The current research on time-domain electromagnetic detection methods for well boreholes is proposed based on the magnetic source measurement mode. Compared with magnetic sources, the electrical source measurement mode, both electrical and magnetic signal acquisition can be used. Its measurement...

... In a well drilled in the DOE FORGE Geothermal test site both electrical borehole scans acquired using Schlumberger’s Formation Micro-scanner Image tool (FMI) and Stoneley waves generated by a borehole sonic tool are used together in a workflow using the strengths of both techniques...

... gamma-ray counts, the capture gamma-ray count ratio and inelastic gamma-ray count ratio from different detectors, a new characterization of the fast neutron cross-section can achieve self-compensation under borehole gas-bearing and the complex completion. Note: This paper was accepted...

... borehole upstream oil & gas log analysis resistivity american association artificial intelligence boundary ml-based deconvolution method exploration geophysicist applied geoscience annual logging symposium ML-based Deconvolution Method for High Resolution Fast Inversion of Induction Log...

... Borehole guided waves (tube waves) are dominant acoustic waves in borehole seismic data. Tube waves can be exploited to characterize the hydraulic properties of fractures intersecting the borehole. Several theoretical tube-wave generation models have been proposed earlier in order to link...

... Heterogeneous elastic property variation in the rock formation surrounding a borehole can cause wave scattering in the borehole acoustic waveforms, which in turn can be used to characterize the formation heterogeneities. Considering the elastic wave scattering caused by the variation of the near...

... In this paper we revisit a very specialized borehole acoustic computational method to compute the fundamental wave types (head waves and borehole guided modes) that make up the full waveform. This opposed to the Real Axis Integration (RAI) method which only yields the sum of these constituents...

... In a research borehole near Dallas, Texas, a 235’ (71.62m) thick succession containing the positive carbon isotope (δC13) excursion associated with the Cenomanian/Turonian Boundary Event (CTBE) is present. More remarkably, based on nearby ammonite work by Kennedy (1988), the portion of the CTBE...

... require a comprehensive understanding of ground conditions for design. upstream oil & gas society borehole refraction microtremor survey multidisciplinary site investigation american association constraint reservoir characterization representation remi investigation exploration...

... The time domain electromagnetic method using magnetic source and electrical source in borehole is studied by numerical simulation. The results show that the borehole time-domain electromagnetic measurement through the magnetoelectric mixed emission and reception mode can effectively solve...

... unconstrained inversions can lead to ambiguous results. A constrained inversion using borehole lithologies and ground-based geophysics data as gradient reference and parameter reference constraints provides a more refined model, enabling higher confidence in the interpretation. The purpose of this study...